net: mvpp2: cls: Invalidate all C2 entries except the ones we use

C2 TCAM entries can be invalidated to avoid unwanted matches. Make sure
all entries are invalidated at init, then validate only the ones we use.
Signed-off-by: Maxime Chevallier <maxime.chevallier@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/marvell/mvpp2/mvpp2.h

@@ -126,6 +126,8 @@
 #define MVPP22_CLS_C2_TCAM_DATA4		0x1b20
 #define     MVPP22_CLS_C2_LU_TYPE(lu)		((lu) & 0x3f)
 #define     MVPP22_CLS_C2_PORT_ID(port)		((port) << 8)
+#define MVPP22_CLS_C2_TCAM_INV			0x1b24
+#define     MVPP22_CLS_C2_TCAM_INV_BIT		BIT(31)
 #define MVPP22_CLS_C2_HIT_CTR			0x1b50
 #define MVPP22_CLS_C2_ACT			0x1b60
 #define     MVPP22_CLS_C2_ACT_RSS_EN(act)	(((act) & 0x3) << 19)

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.c

@@ -489,8 +489,16 @@ static void mvpp2_cls_flow_lkp_init(struct mvpp2 *priv,
 static void mvpp2_cls_c2_write(struct mvpp2 *priv,
 			       struct mvpp2_cls_c2_entry *c2)
 {
+	u32 val;
 	mvpp2_write(priv, MVPP22_CLS_C2_TCAM_IDX, c2->index);
 
+	val = mvpp2_read(priv, MVPP22_CLS_C2_TCAM_INV);
+	if (c2->valid)
+		val &= ~MVPP22_CLS_C2_TCAM_INV_BIT;
+	else
+		val |= MVPP22_CLS_C2_TCAM_INV_BIT;
+	mvpp2_write(priv, MVPP22_CLS_C2_TCAM_INV, val);
+
 	mvpp2_write(priv, MVPP22_CLS_C2_ACT, c2->act);
 
 	mvpp2_write(priv, MVPP22_CLS_C2_ATTR0, c2->attr[0]);
@@ -509,6 +517,7 @@ static void mvpp2_cls_c2_write(struct mvpp2 *priv,
 void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
 		       struct mvpp2_cls_c2_entry *c2)
 {
+	u32 val;
 	mvpp2_write(priv, MVPP22_CLS_C2_TCAM_IDX, index);
 
 	c2->index = index;
@@ -525,6 +534,9 @@ void mvpp2_cls_c2_read(struct mvpp2 *priv, int index,
 	c2->attr[1] = mvpp2_read(priv, MVPP22_CLS_C2_ATTR1);
 	c2->attr[2] = mvpp2_read(priv, MVPP22_CLS_C2_ATTR2);
 	c2->attr[3] = mvpp2_read(priv, MVPP22_CLS_C2_ATTR3);
+
+	val = mvpp2_read(priv, MVPP22_CLS_C2_TCAM_INV);
+	c2->valid = !(val & MVPP22_CLS_C2_TCAM_INV_BIT);
 }
 
 /* Initialize the flow table entries for the given flow */
@@ -807,6 +819,8 @@ static void mvpp2_port_c2_cls_init(struct mvpp2_port *port)
 	c2.attr[0] = MVPP22_CLS_C2_ATTR0_QHIGH(qh) |
 		      MVPP22_CLS_C2_ATTR0_QLOW(ql);
 
+	c2.valid = true;
+
 	mvpp2_cls_c2_write(port->priv, &c2);
 }
 
@@ -815,6 +829,7 @@ void mvpp2_cls_init(struct mvpp2 *priv)
 {
 	struct mvpp2_cls_lookup_entry le;
 	struct mvpp2_cls_flow_entry fe;
+	struct mvpp2_cls_c2_entry c2;
 	int index;
 
 	/* Enable classifier */
@@ -838,6 +853,14 @@ void mvpp2_cls_init(struct mvpp2 *priv)
 		mvpp2_cls_lookup_write(priv, &le);
 	}
 
+	/* Clear C2 TCAM engine table */
+	memset(&c2, 0, sizeof(c2));
+	c2.valid = false;
+	for (index = 0; index < MVPP22_CLS_C2_N_ENTRIES; index++) {
+		c2.index = index;
+		mvpp2_cls_c2_write(priv, &c2);
+	}
+
 	mvpp2_cls_port_init_flows(priv);
 }
 

drivers/net/ethernet/marvell/mvpp2/mvpp2_cls.h

@@ -97,9 +97,14 @@ enum mvpp22_cls_c2_fwd_action {
 
 struct mvpp2_cls_c2_entry {
 	u32 index;
+	/* TCAM lookup key */
 	u32 tcam[MVPP2_CLS_C2_TCAM_WORDS];
+	/* Actions to perform upon TCAM match */
 	u32 act;
+	/* Attributes relative to the actions to perform */
 	u32 attr[MVPP2_CLS_C2_ATTR_WORDS];
+	/* Entry validity */
+	u8 valid;
 };
 
 /* Classifier C2 engine entries */